V60 B4 Mild Hybrid - brake issue

HertsSwede · Dec 8th, 2021, 09:22

Hi,

I have a 2021 V60 B4 Mild Hybrid wagon. Car is effectively brand new, drives well but has an ongoing brake issue.

When you brake and slow to halt, quite often there an audible 'clunk' as one piece of braking regen mechanism meshes with another (?). Or could it be transmission shunt?

Definitely seems to be coming from the engine bay area....

Local main dealer maintains it cannot find anything wrong. Car doesn't do this braking clunk thing every time, but it does it a lot - anyone on here had the same issue? And if so, was it resolved OK?

The regen system has two main components - starter/generator and 48V battery, as I understand. Can't be the battery, so could it be starter/generator unit so some other tech piece of the system? Maybe the ABS?

Any clues much appreciated. Thanks!

HertsSwede · Dec 12th, 2021, 09:55

Anyone have any thoughts on this? Thanks!

Quote:

Originally Posted by HertsSwede

Hi,

I have a 2021 V60 B4 Mild Hybrid wagon. Car is effectively brand new, drives well but has an ongoing brake issue.

When you brake and slow to halt, quite often there an audible 'clunk' as one piece of braking regen mechanism meshes with another (?). Or could it be transmission shunt?

Definitely seems to be coming from the engine bay area....

Local main dealer maintains it cannot find anything wrong. Car doesn't do this braking clunk thing every time, but it does it a lot - anyone on here had the same issue? And if so, was it resolved OK?

The regen system has two main components - starter/generator and 48V battery, as I understand. Can't be the battery, so could it be starter/generator unit so some other tech piece of the system? Maybe the ABS?

Any clues much appreciated. Thanks!

Handyandy2 · Dec 12th, 2021, 11:16

Is it anything to do with the auto hold? Try pressing the button by the hand brake to turn off the green light and see if it still does it.

Dec 8th, 2021, 09:22	#1
HertsSwede New Member Last Online: Mar 11th, 2022 19:17 Join Date: Dec 2021 Location: Herts	V60 B4 Mild Hybrid - brake issue Hi, I have a 2021 V60 B4 Mild Hybrid wagon. Car is effectively brand new, drives well but has an ongoing brake issue. When you brake and slow to halt, quite often there an audible 'clunk' as one piece of braking regen mechanism meshes with another (?). Or could it be transmission shunt? Definitely seems to be coming from the engine bay area.... Local main dealer maintains it cannot find anything wrong. Car doesn't do this braking clunk thing every time, but it does it a lot - anyone on here had the same issue? And if so, was it resolved OK? The regen system has two main components - starter/generator and 48V battery, as I understand. Can't be the battery, so could it be starter/generator unit so some other tech piece of the system? Maybe the ABS? Any clues much appreciated. Thanks!

Dec 12th, 2021, 11:16	#3
Handyandy2 Junior Member Last Online: May 4th, 2024 10:23 Join Date: Jun 2021 Location: West Midlands	Is it anything to do with the auto hold? Try pressing the button by the hand brake to turn off the green light and see if it still does it.

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